Karen is reborn, but...she’s ordinary—no powers, no special skills, and no grand mission. Luckily, her life is easy as a noble. Well, until her mother forgets that she exists, kick-starting a series of events that will change Karen’s life forever.

When old rivals Raid and Eluria reincarnate and reunite a thousand years after dying, there’s only one thing for them to do: settle who’s stronger once and for all—even if it means getting engaged and attending the Royal Institute of Magic together!

What’s worse: getting disowned by your aristocratic family, or discovering a sinister plot that only you can stop? Neither seems to faze Octavia. But this young, devilishly handsome marquis who seems intent on tagging along... He’s another story!

Nestled in Kyoto’s Teramachi-Sanjo shopping arcade is the antique shop Kura, where high school girl Aoi has a part-time job. With the manager’s son, Kiyotaka—the “Holmes of Kyoto”—she helps solve various strange cases brought to them by clients.